Pump-plunger.



l Patented Feb. 13, w17.

[3.1. WALLER,

PUMP PLUN APPLwATmn man Nov. 15, 1915.

.EN T01?.

ALLI/L? FFXQE.

PERRY WALLER, OF LOS ANGELES, CALIFORNIA.

PUMP-PLUNGER.

To aZZwLom t may concern.'

Be it known'that I, PERRY J. TVALLnn, a citizen of the United States,residing at the city of Los Angeles, county of Los Angeles, l

and State of California, have invented new and useful Improvements 1nPump-Plungers, of which `the following is a specific-ation.

My invention relates to that class of pump plungers' in which cupleathers are used and the object thereof is to produce a more etlicientplunger, and one in which the cup leathers will last longer than thoseno'w in common use. h

In the drawings forming apart of this application, I have shown acentral section of a, fragment of a pump barrel with my improved plungertherein, partly in section andlpartly in elevation.

Referring to the drawings 5 is a pump barrel. 6 are the inside ringswhich are mounted on the pump rod 7 in the usual manner. 9 is the metalfollower plate which, adjacent to the pump barrel, isl reduced inthickness as at 10 so that the/outer edges and flange of the cupleathers are not engaged by the follower plate and said plate v onlyengages the central portions of the cup leathers, said follower p'latebeing stepped on the surfaces adjacent to the cup leathers.v

By this construction the outer edges of the cup leathers are allowed toyield slightly when the plunger is pumping thereby cansing the flange tomore closely contact with Specification of Letters Patent.

the pump barrel than is possible when the pump leather isengaged out tothe edges by the follower plate as is the case in the usual constructionof plungers. I have illustrated my invention applied to a double actingplunger, but it is obvious that it can be used equally well with asingle acting plunger, in which case the only surface stepped would bethe one adjacent to the cup leather.

Having claim is:v

l. A plunger pump follower plate having a central hole therein and aperipheral niargin rabbeted, the central portions heing adapted tosupport the central portions of the cup leather when pumping, and theedges to contact with the pump barrel, in combination with a plunger rodto which Said plate is attached, a cup leather and a pump barrel.

2. In a pump, the combination of a pump barrel; a plunger rod; avfollower plate having a working fit in the pump barrel'sccured to saidrod, said plate having the central portions thicker than theportiouadjacent to the pump barrel; and a cup leather having the centralportions thereof contacting with the central portions of the plate andits outer portions spaced from the outer por-` tions of the plate.

In Witness that I claim the foregoing I have hereunto subscribed my namethis (3th day of July, 1915.

' PERRY J. VVALLER.

Patented Feb. 13, .1391?.r Application filed November 15, 1915. SerialNo. 61,512.

